ALLEN PARK — Detroit Lions defensive end Ziggy Ansah was at practice Tuesday but did not work out.

Louis Delmas, Calvin Johnson, Ndamukong Suh and John Wendling returned to the practice field after sitting out last week.

Johnson missed the final three preseason games with a bruised knee. But was running routes Tuesday in the early portion of practice open to the media.

Coach Jim Schwartz would not offer any specifics on Ansah’s injury. The first official injury report will be released at 4 p.m. Thursday.

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“We’ll get all those guys back as quick as we can. I think we’ll be fairly healthy going into the first game,’’ Schwartz said. “It’s about the best we can expect coming out of training camp. But, as coaches, we’re ready to go any direction if we have to.’’

Ansah, who is expected to start at right defensive end, took a blind-side hit to the head on Aug. 24 by teammate Leroy Harris.

He came out the next day for warm-ups prior to practice and had to leave the field. The team has never confirmed suspicions that he sustained a concussion.

Even though Ansah is a relatively inexperienced player, Schwartz said he didn’t need more work than other players.

“He got a lot of reps early in camp,’’ Schwartz said. “I think all of our players need as many reps as they can possibly get. He’s no different than anybody else on the team as far as that goes.’’

Ansah had no practiced with the team since that point. He missed the final preseason game at Buffalo and, in fact, did not even make the trip with the team.

Ansah was the Lions’ first-round pick out of Brigham Young. Just because he didn’t practice Tuesday does not necessarily mean he won’t play in Sunday’s opener against the Minnesota Vikings. There are three practices remaining this week.

Schwartz did confirm that running back Montell Owens (knee) will be placed on short-term injured reserve today which opens a roster spot. Owens will be available to return in six weeks.

Rookie tight end Michael Williams was placed on injured reserve Saturday shutting him down for the season. His broken hand as a “season-ender” according to Schwartz.